Each drying device has its specific scope of application, and several drying devices that can meet the basic requirements can be found for each material, but only one is suitable. In case of improper selection, users not only have to bear the unnecessary one-time high procurement cost, but also pay a heavy price in the whole service life, such as low efficiency, high energy consumption, high operation cost, poor product quality, and even the device can not operate normally at all.

以下是干燥装置选型的一般原则，很难说哪一项或哪几项是重要的，理想的选型必须根据自己的条件有所侧重，有时折中是必要的。

The following are the general principles of type selection of drying device. It is difficult to say which one or several items are important. The ideal type selection must focus on its own conditions, and sometimes compromise is necessary.

1.适用性-------干燥装置首先必须能适用于特定物料，且满足物料干燥的基本使用要求，包括能很好的处理物料（给进、输送、流态化、分散、传热、排出等），并能满足处理量、脱水量、产品质量等方面的基本要求。

1. Applicability ---- firstly, the drying device must be applicable to specific materials and meet the basic use requirements of material drying, including good treatment of materials (feeding, conveying, fluidization, dispersion, heat transfer, discharge, etc.), and meet the basic requirements of treatment capacity, dehydration, product quality, etc.

2.干燥速率高---仅就干燥速率看，对流干燥时物料高度分散在热空气中，临界含水率低，干燥速度快，而且同是对流干燥，干燥方法不同临界含水率也不同，因而干燥速率也不同。

2. High drying rate - only in terms of drying rate, during convective drying, the materials are highly dispersed in hot air, with low critical moisture content and fast drying speed. Moreover, with the same convective drying, the drying methods are different, and the critical moisture content is also different, so the drying rate is also different.

3.耗能低-------不同干燥方法耗能指标不同，一般传导式干燥的热效率理论上可达100%，对流式干燥只能70%左右。

3. Low energy consumption ---- different drying methods have different energy consumption indicators. Generally, the thermal efficiency of conduction drying can reach 100% in theory, and that of convection drying can only be about 70%.

4.节省投资-----完成同样功能的干燥装置，有时其造价相差悬殊，应择其低者选用。

4. Save investment ---- sometimes the cost of drying devices with the same function varies greatly, and the lower one should be selected.

5.运行成本低---设备折旧、耗能、人工费、维修费，备件费...等运行费用要尽量低廉。

5. Low operation cost - equipment depreciation, energy consumption, labor cost, maintenance cost, spare parts cost... And other operation costs shall be as low as possible.

6.优先选择结构简单、备品备件供应充足、可靠性高、寿命长的干燥装置。

6. The drying device with simple structure, sufficient supply of spare parts, high reliability and long service life shall be preferred.

7.符合环保要求，工作条件好，安 全性高。

7. Meet environmental protection requirements, good working conditions and high safety.

8.选型前能做出物料的干燥实验，深入了解类似物料已经使用的干燥装置（优缺点），往往对恰当选型有帮助。

8. Be able to make drying experiments of materials before type selection, and deeply understand the drying devices (advantages and disadvantages) used for similar materials, which is often helpful for proper type selection.